I actually ruined a friendship for about 6 months over them. I'm an unstable bipolar, so it doesn't take much to set me off. I did four of them with a friend and got so irate with him that I stopped talking to him. What for you may ask? Nothing. We mended things up and are better than ever but to this day I still feel a retard over it. But he always jokes about them so it's all good.